Improvement in steam-engines



T. WELHAM; STEAM ENGINE. No. 46,165. Patented Jan. 31, 1-865.

UNITED STATES PATENT OFFICE.

'ruonns WELHAM, or WASHINGTON, nisrnior' OF COLUMBIA.

IMPROVEMENT in STEAM-ENGINES.

T0 at whom it may concern:

Be it known that I, THOMAS WELHAM, formerly of Nebraska,- but now of Washing, ton city, District of Colun1bia,'have invented new and useful Improvements inSteam or Gas Engines; and I do hereby declare the following to be an exact description thereof, reference being had to the accompanying drawings, and. to' .the letters of reference marked thereon, making a part of this speci-- iication- Then-attire of my invention consists inplacing one, two, or more cylinders (having right and left hand screws therein) on the inside or outside ot'a'stemn or gas boiler, for the purpose of receiving and discharging the steam or To enable others to make and use my'inrention, I will proceed to describe its construc tion and operation as follows:

' Figure 1 represents the boiler and exhaustpipe. Fig. 2 represents the cylinders operating on the inside of the boiler; and Fig. 3 shows the ends of the cylinders, the receiving and exhaust pipes,and the course of the steam or air as indicated by'the arrows.

A represents an ordinary boiler. B B are one, two, or more flanged inclosed cylinders, screw-shaped, as right and left hand screws, to be placed either aside of each other or one above the other, the flanges-C 0 being connected atthe center of the cylinders and running from their centers to the outer ends of the axles or inner cylinders in opposite directions. ()n the one cylinder, B, as seen at Fig. 2, I have a circular flange, D, at the center of the cylinder, and on the other cylinder .15, I have a flange, E E, on each end and no circular flangein the center of the cylinder. Tue cylinders are connected by cog-wheels Gr, or any ordinary mode of gearing for the pur pose of driving the cylinders simultaneously. On the opposite end of one of the cylinders, I have a driving-wheel, H, to propel the machincry to which the engine may be attached-by belt or other ordinary gearing. The cylinders are located inside of the boiler A above the water, as shown at Fig. 3, for the purpose of receiving the steam or gas at the receivingpipe Jlwhieh passes on one side of the circnlar flange D- to one side over the right-hand screw and to ,the other side over the left-hand screw in opp-.isite directions to hoth'ends of the-cylinder,hausing the rotary motion, thence through a chute, K, at each eudof the cylinder to the eudsof the next,cylinder, the steam center of the cylinder, and thence escaping and discharged at the discharge-pipe L, through the boiler A to the outside, and thus placed alternately, so that the steam will pass from the ends.of one to the center of the other, and from its center to thecircular'flange D on the center of the next cylinder.

By rnnuing'iny cylinders on the inside oi the boiler, I prevent the"'steam from condensing but I may place the cylinders on the outside, if I think proper, so asto again condense the steam.

What Iclairn as my invention, and desire (to secure by Letters Patent, is

Placing one, two, or more right and left hand screws in the cylinders, as herein described, on the inside or outside of a steam or gas boiler, so as to receive and discharge the steam or gas,"snbstantially as and for the purposes set forth. THOS. WELHAM.

Witnesses:

J FRANKLIN REIGART,

Emu. F. BROWN.

passing on between the flanges O U to the I intend to use two or a series of cylinders 

